{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 第二章习题\n",
    "\n",
    "### 一、填空题\n",
    "\n",
    "1.列表的`sort()`方法没有返回值,或者说返回值为________."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "None"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2.已知列表 `data=[1,2,30 4]`，那么`data[2:100]`的值为________."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "[30,4]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "3.己知`x=3`和`y=5`,那么执行语句`x,y=y,x`之后，`y`的值为________."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "3"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "4．已知字典 `data= {'a;97, 'A' :65}`,那么`data.get('a', None)`的值为________."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "97"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 二、判断题\n",
    "\n",
    "1.生成器表达式的计算结果是一个元组。`(    )`"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "×"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2．包含列表的元组可以作为字典的“键”。`(    )`"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "×"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "3．包含列表的元组不可以作为集合的元素。`(    )`"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "×"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "4．列表的`rindex()`方法返回指定元素在列表中最后一次出现的位置。`(    )`"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "×"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 三、编程题\n",
    "\n",
    "1.输入一个字符串，输出其中每个字符的出现次数。要求使用标准库`collotections`中的`Counter`类,请自行查阅相关用法。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "请输入一个字符串：'swfujjkloo'\n"
     ]
    }
   ],
   "source": [
    "from collections import Counter\n",
    "text = input('请输入一个字符串：')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Counter({\"'\": 2, 'j': 2, 'o': 2, 's': 1, 'w': 1, 'f': 1, 'u': 1, 'k': 1, 'l': 1})\n"
     ]
    }
   ],
   "source": [
    "frequencies = Counter(text)\n",
    "print(frequencies)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2．输入一个字符串,输出其中只出现了一次的字符及其下标。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "请输入一个字符串：'ssddccvcfsdsdd'\n"
     ]
    }
   ],
   "source": [
    "text = input('请输入一个字符串：')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[('v', 7), ('f', 9)]\n"
     ]
    }
   ],
   "source": [
    "positions = [(ch,index)for index, ch in enumerate(text) if text.index(ch) == text.rindex(ch)]\n",
    "print(positions)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "3．输入一个字符串,输出其中每个唯一字符最后一次出现的下标。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "请输入一个字符串：‘sdasdasd’\n"
     ]
    }
   ],
   "source": [
    "x = input('请输入一个字符串：')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "4．输入包含若干集合的列表，输出这些集合的并集。提示:使用`reduce()`函数和`operator`模块中的运算实现多个集合的并集。"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{1, 2, 3, 4, 5, 6, 7}\n"
     ]
    }
   ],
   "source": [
    "a={1,2,3,4}\n",
    "b={3,5,6,7}\n",
    "c=a|b\n",
    "print(c)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "5．输入一个字符串,检查该字符串是否为回文（正着读和反看读都一样的字符串)，如果是就输出`Yes`，否则输出`No`。要求使用切片实现"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "请输入一个字符串‘asdffdsa’\n"
     ]
    }
   ],
   "source": [
    "str1 = input('请输入一个字符串')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "No\n"
     ]
    }
   ],
   "source": [
    "str2 = str1[::-1]\n",
    "if str1 ==str2:\n",
    "    print('Yes')\n",
    "else:\n",
    "    print('No')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## 课本上65页课后习题"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1:可迭代对象 \n",
    "2：ture\n",
    "3:None\n",
    "4：remove\n",
    "5：[3,4,5,6]\n",
    "6；大括号 键 值 键\n",
    "7：items keys values\n",
    "8:dict('a':'b')\n",
    "9:  b=a[::3]\n",
    "10:[5 fori in range(10)] \n",
    "11:不可以"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "12\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "13"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "请输入一个大于2的自然数：1000\n"
     ]
    }
   ],
   "source": [
    "number = int(input('请输入一个大于2的自然数：'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530, 531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556, 557, 558, 559, 560, 561, 562, 563, 564, 565, 566, 567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582, 583, 584, 585, 586, 587, 588, 589, 590, 591, 592, 593, 594, 595, 596, 597, 598, 599, 600, 601, 602, 603, 604, 605, 606, 607, 608, 609, 610, 611, 612, 613, 614, 615, 616, 617, 618, 619, 620, 621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 631, 632, 633, 634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648, 649, 650, 651, 652, 653, 654, 655, 656, 657, 658, 659, 660, 661, 662, 663, 664, 665, 666, 667, 668, 669, 670, 671, 672, 673, 674, 675, 676, 677, 678, 679, 680, 681, 682, 683, 684, 685, 686, 687, 688, 689, 690, 691, 692, 693, 694, 695, 696, 697, 698, 699, 700, 701, 702, 703, 704, 705, 706, 707, 708, 709, 710, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720, 721, 722, 723, 724, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736, 737, 738, 739, 740, 741, 742, 743, 744, 745, 746, 747, 748, 749, 750, 751, 752, 753, 754, 755, 756, 757, 758, 759, 760, 761, 762, 763, 764, 765, 766, 767, 768, 769, 770, 771, 772, 773, 774, 775, 776, 777, 778, 779, 780, 781, 782, 783, 784, 785, 786, 787, 788, 789, 790, 791, 792, 793, 794, 795, 796, 797, 798, 799, 800, 801, 802, 803, 804, 805, 806, 807, 808, 809, 810, 811, 812, 813, 814, 815, 816, 817, 818, 819, 820, 821, 822, 823, 824, 825, 826, 827, 828, 829, 830, 831, 832, 833, 834, 835, 836, 837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 847, 848, 849, 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860, 861, 862, 863, 864, 865, 866, 867, 868, 869, 870, 871, 872, 873, 874, 875, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885, 886, 887, 888, 889, 890, 891, 892, 893, 894, 895, 896, 897, 898, 899, 900, 901, 902, 903, 904, 905, 906, 907, 908, 909, 910, 911, 912, 913, 914, 915, 916, 917, 918, 919, 920, 921, 922, 923, 924, 925, 926, 927, 928, 929, 930, 931, 932, 933, 934, 935, 936, 937, 938, 939, 940, 941, 942, 943, 944, 945, 946, 947, 948, 949, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 960, 961, 962, 963, 964, 965, 966, 967, 968, 969, 970, 971, 972, 973, 974, 975, 976, 977, 978, 979, 980, 981, 982, 983, 984, 985, 986, 987, 988, 989, 990, 991, 992, 993, 994, 995, 996, 997, 998, 999]\n",
      "lst: [2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, 353, 355, 357, 359, 361, 363, 365, 367, 369, 371, 373, 375, 377, 379, 381, 383, 385, 387, 389, 391, 393, 395, 397, 399, 401, 403, 405, 407, 409, 411, 413, 415, 417, 419, 421, 423, 425, 427, 429, 431, 433, 435, 437, 439, 441, 443, 445, 447, 449, 451, 453, 455, 457, 459, 461, 463, 465, 467, 469, 471, 473, 475, 477, 479, 481, 483, 485, 487, 489, 491, 493, 495, 497, 499, 501, 503, 505, 507, 509, 511, 513, 515, 517, 519, 521, 523, 525, 527, 529, 531, 533, 535, 537, 539, 541, 543, 545, 547, 549, 551, 553, 555, 557, 559, 561, 563, 565, 567, 569, 571, 573, 575, 577, 579, 581, 583, 585, 587, 589, 591, 593, 595, 597, 599, 601, 603, 605, 607, 609, 611, 613, 615, 617, 619, 621, 623, 625, 627, 629, 631, 633, 635, 637, 639, 641, 643, 645, 647, 649, 651, 653, 655, 657, 659, 661, 663, 665, 667, 669, 671, 673, 675, 677, 679, 681, 683, 685, 687, 689, 691, 693, 695, 697, 699, 701, 703, 705, 707, 709, 711, 713, 715, 717, 719, 721, 723, 725, 727, 729, 731, 733, 735, 737, 739, 741, 743, 745, 747, 749, 751, 753, 755, 757, 759, 761, 763, 765, 767, 769, 771, 773, 775, 777, 779, 781, 783, 785, 787, 789, 791, 793, 795, 797, 799, 801, 803, 805, 807, 809, 811, 813, 815, 817, 819, 821, 823, 825, 827, 829, 831, 833, 835, 837, 839, 841, 843, 845, 847, 849, 851, 853, 855, 857, 859, 861, 863, 865, 867, 869, 871, 873, 875, 877, 879, 881, 883, 885, 887, 889, 891, 893, 895, 897, 899, 901, 903, 905, 907, 909, 911, 913, 915, 917, 919, 921, 923, 925, 927, 929, 931, 933, 935, 937, 939, 941, 943, 945, 947, 949, 951, 953, 955, 957, 959, 961, 963, 965, 967, 969, 971, 973, 975, 977, 979, 981, 983, 985, 987, 989, 991, 993, 995, 997, 999]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 35, 37, 41, 43, 47, 49, 53, 55, 59, 61, 65, 67, 71, 73, 77, 79, 83, 85, 89, 91, 95, 97, 101, 103, 107, 109, 113, 115, 119, 121, 125, 127, 131, 133, 137, 139, 143, 145, 149, 151, 155, 157, 161, 163, 167, 169, 173, 175, 179, 181, 185, 187, 191, 193, 197, 199, 203, 205, 209, 211, 215, 217, 221, 223, 227, 229, 233, 235, 239, 241, 245, 247, 251, 253, 257, 259, 263, 265, 269, 271, 275, 277, 281, 283, 287, 289, 293, 295, 299, 301, 305, 307, 311, 313, 317, 319, 323, 325, 329, 331, 335, 337, 341, 343, 347, 349, 353, 355, 359, 361, 365, 367, 371, 373, 377, 379, 383, 385, 389, 391, 395, 397, 401, 403, 407, 409, 413, 415, 419, 421, 425, 427, 431, 433, 437, 439, 443, 445, 449, 451, 455, 457, 461, 463, 467, 469, 473, 475, 479, 481, 485, 487, 491, 493, 497, 499, 503, 505, 509, 511, 515, 517, 521, 523, 527, 529, 533, 535, 539, 541, 545, 547, 551, 553, 557, 559, 563, 565, 569, 571, 575, 577, 581, 583, 587, 589, 593, 595, 599, 601, 605, 607, 611, 613, 617, 619, 623, 625, 629, 631, 635, 637, 641, 643, 647, 649, 653, 655, 659, 661, 665, 667, 671, 673, 677, 679, 683, 685, 689, 691, 695, 697, 701, 703, 707, 709, 713, 715, 719, 721, 725, 727, 731, 733, 737, 739, 743, 745, 749, 751, 755, 757, 761, 763, 767, 769, 773, 775, 779, 781, 785, 787, 791, 793, 797, 799, 803, 805, 809, 811, 815, 817, 821, 823, 827, 829, 833, 835, 839, 841, 845, 847, 851, 853, 857, 859, 863, 865, 869, 871, 875, 877, 881, 883, 887, 889, 893, 895, 899, 901, 905, 907, 911, 913, 917, 919, 923, 925, 929, 931, 935, 937, 941, 943, 947, 949, 953, 955, 959, 961, 965, 967, 971, 973, 977, 979, 983, 985, 989, 991, 995, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 77, 79, 83, 89, 91, 97, 101, 103, 107, 109, 113, 119, 121, 127, 131, 133, 137, 139, 143, 149, 151, 157, 161, 163, 167, 169, 173, 179, 181, 187, 191, 193, 197, 199, 203, 209, 211, 217, 221, 223, 227, 229, 233, 239, 241, 247, 251, 253, 257, 259, 263, 269, 271, 277, 281, 283, 287, 289, 293, 299, 301, 307, 311, 313, 317, 319, 323, 329, 331, 337, 341, 343, 347, 349, 353, 359, 361, 367, 371, 373, 377, 379, 383, 389, 391, 397, 401, 403, 407, 409, 413, 419, 421, 427, 431, 433, 437, 439, 443, 449, 451, 457, 461, 463, 467, 469, 473, 479, 481, 487, 491, 493, 497, 499, 503, 509, 511, 517, 521, 523, 527, 529, 533, 539, 541, 547, 551, 553, 557, 559, 563, 569, 571, 577, 581, 583, 587, 589, 593, 599, 601, 607, 611, 613, 617, 619, 623, 629, 631, 637, 641, 643, 647, 649, 653, 659, 661, 667, 671, 673, 677, 679, 683, 689, 691, 697, 701, 703, 707, 709, 713, 719, 721, 727, 731, 733, 737, 739, 743, 749, 751, 757, 761, 763, 767, 769, 773, 779, 781, 787, 791, 793, 797, 799, 803, 809, 811, 817, 821, 823, 827, 829, 833, 839, 841, 847, 851, 853, 857, 859, 863, 869, 871, 877, 881, 883, 887, 889, 893, 899, 901, 907, 911, 913, 917, 919, 923, 929, 931, 937, 941, 943, 947, 949, 953, 959, 961, 967, 971, 973, 977, 979, 983, 989, 991, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 121, 127, 131, 137, 139, 143, 149, 151, 157, 163, 167, 169, 173, 179, 181, 187, 191, 193, 197, 199, 209, 211, 221, 223, 227, 229, 233, 239, 241, 247, 251, 253, 257, 263, 269, 271, 277, 281, 283, 289, 293, 299, 307, 311, 313, 317, 319, 323, 331, 337, 341, 347, 349, 353, 359, 361, 367, 373, 377, 379, 383, 389, 391, 397, 401, 403, 407, 409, 419, 421, 431, 433, 437, 439, 443, 449, 451, 457, 461, 463, 467, 473, 479, 481, 487, 491, 493, 499, 503, 509, 517, 521, 523, 527, 529, 533, 541, 547, 551, 557, 559, 563, 569, 571, 577, 583, 587, 589, 593, 599, 601, 607, 611, 613, 617, 619, 629, 631, 641, 643, 647, 649, 653, 659, 661, 667, 671, 673, 677, 683, 689, 691, 697, 701, 703, 709, 713, 719, 727, 731, 733, 737, 739, 743, 751, 757, 761, 767, 769, 773, 779, 781, 787, 793, 797, 799, 803, 809, 811, 817, 821, 823, 827, 829, 839, 841, 851, 853, 857, 859, 863, 869, 871, 877, 881, 883, 887, 893, 899, 901, 907, 911, 913, 919, 923, 929, 937, 941, 943, 947, 949, 953, 961, 967, 971, 977, 979, 983, 989, 991, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 169, 173, 179, 181, 191, 193, 197, 199, 211, 221, 223, 227, 229, 233, 239, 241, 247, 251, 257, 263, 269, 271, 277, 281, 283, 289, 293, 299, 307, 311, 313, 317, 323, 331, 337, 347, 349, 353, 359, 361, 367, 373, 377, 379, 383, 389, 391, 397, 401, 403, 409, 419, 421, 431, 433, 437, 439, 443, 449, 457, 461, 463, 467, 479, 481, 487, 491, 493, 499, 503, 509, 521, 523, 527, 529, 533, 541, 547, 551, 557, 559, 563, 569, 571, 577, 587, 589, 593, 599, 601, 607, 611, 613, 617, 619, 629, 631, 641, 643, 647, 653, 659, 661, 667, 673, 677, 683, 689, 691, 697, 701, 703, 709, 713, 719, 727, 731, 733, 739, 743, 751, 757, 761, 767, 769, 773, 779, 787, 793, 797, 799, 809, 811, 817, 821, 823, 827, 829, 839, 841, 851, 853, 857, 859, 863, 871, 877, 881, 883, 887, 893, 899, 901, 907, 911, 919, 923, 929, 937, 941, 943, 947, 949, 953, 961, 967, 971, 977, 983, 989, 991, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 289, 293, 307, 311, 313, 317, 323, 331, 337, 347, 349, 353, 359, 361, 367, 373, 379, 383, 389, 391, 397, 401, 409, 419, 421, 431, 433, 437, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 493, 499, 503, 509, 521, 523, 527, 529, 541, 547, 551, 557, 563, 569, 571, 577, 587, 589, 593, 599, 601, 607, 613, 617, 619, 629, 631, 641, 643, 647, 653, 659, 661, 667, 673, 677, 683, 691, 697, 701, 703, 709, 713, 719, 727, 731, 733, 739, 743, 751, 757, 761, 769, 773, 779, 787, 797, 799, 809, 811, 817, 821, 823, 827, 829, 839, 841, 851, 853, 857, 859, 863, 877, 881, 883, 887, 893, 899, 901, 907, 911, 919, 929, 937, 941, 943, 947, 953, 961, 967, 971, 977, 983, 989, 991, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 361, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 437, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 529, 541, 547, 551, 557, 563, 569, 571, 577, 587, 589, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 667, 673, 677, 683, 691, 701, 703, 709, 713, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 779, 787, 797, 809, 811, 817, 821, 823, 827, 829, 839, 841, 851, 853, 857, 859, 863, 877, 881, 883, 887, 893, 899, 907, 911, 919, 929, 937, 941, 943, 947, 953, 961, 967, 971, 977, 983, 989, 991, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 529, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 667, 673, 677, 683, 691, 701, 709, 713, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 841, 851, 853, 857, 859, 863, 877, 881, 883, 887, 899, 907, 911, 919, 929, 937, 941, 943, 947, 953, 961, 967, 971, 977, 983, 989, 991, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 841, 853, 857, 859, 863, 877, 881, 883, 887, 899, 907, 911, 919, 929, 937, 941, 947, 953, 961, 967, 971, 977, 983, 991, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 961, 967, 971, 977, 983, 991, 997]\n",
      "lst: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997]\n",
      "[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997]\n"
     ]
    }
   ],
   "source": [
    "lst = list(range(2, number))\n",
    "print(lst)\n",
    "m = int(number ** 0.5)\n",
    "for index , value in enumerate(lst):\n",
    "    if value > m:\n",
    "        break\n",
    "    lst[index + 1:] = filter(lambda x: x % value != 0, lst[index + 1:])\n",
    "    print(\"lst:\", lst)\n",
    "print(lst)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "14 从列表尾部进行元素的增加与删除可以提高处理速度"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "15"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 : 7\n",
      "1 : 10\n",
      "2 : 11\n",
      "3 : 5\n",
      "4 : 7\n",
      "5 : 4\n",
      "6 : 13\n",
      "7 : 10\n",
      "8 : 19\n",
      "9 : 10\n",
      "10 : 6\n",
      "11 : 7\n",
      "12 : 10\n",
      "13 : 6\n",
      "14 : 5\n",
      "15 : 15\n",
      "16 : 11\n",
      "17 : 10\n",
      "18 : 10\n",
      "19 : 6\n",
      "20 : 7\n",
      "21 : 9\n",
      "22 : 10\n",
      "23 : 11\n",
      "24 : 14\n",
      "25 : 8\n",
      "26 : 6\n",
      "27 : 13\n",
      "28 : 13\n",
      "29 : 10\n",
      "30 : 12\n",
      "31 : 16\n",
      "32 : 14\n",
      "33 : 8\n",
      "34 : 13\n",
      "35 : 12\n",
      "36 : 20\n",
      "37 : 5\n",
      "38 : 5\n",
      "39 : 11\n",
      "40 : 13\n",
      "41 : 9\n",
      "42 : 12\n",
      "43 : 6\n",
      "44 : 12\n",
      "45 : 10\n",
      "46 : 7\n",
      "47 : 7\n",
      "48 : 6\n",
      "49 : 10\n",
      "50 : 11\n",
      "51 : 9\n",
      "52 : 13\n",
      "53 : 4\n",
      "54 : 7\n",
      "55 : 11\n",
      "56 : 1\n",
      "57 : 11\n",
      "58 : 17\n",
      "59 : 10\n",
      "60 : 11\n",
      "61 : 14\n",
      "62 : 7\n",
      "63 : 11\n",
      "64 : 11\n",
      "65 : 12\n",
      "66 : 11\n",
      "67 : 12\n",
      "68 : 8\n",
      "69 : 3\n",
      "70 : 7\n",
      "71 : 7\n",
      "72 : 12\n",
      "73 : 9\n",
      "74 : 6\n",
      "75 : 8\n",
      "76 : 12\n",
      "77 : 15\n",
      "78 : 11\n",
      "79 : 17\n",
      "80 : 9\n",
      "81 : 10\n",
      "82 : 5\n",
      "83 : 15\n",
      "84 : 11\n",
      "85 : 10\n",
      "86 : 6\n",
      "87 : 12\n",
      "88 : 10\n",
      "89 : 9\n",
      "90 : 10\n",
      "91 : 9\n",
      "92 : 12\n",
      "93 : 10\n",
      "94 : 13\n",
      "95 : 9\n",
      "96 : 8\n",
      "97 : 12\n",
      "98 : 12\n",
      "99 : 13\n",
      "100 : 6\n"
     ]
    }
   ],
   "source": [
    "import random\n",
    "blist = [random.randint(0,100) for i in range(1000)]\n",
    "s = set(blist)\n",
    "for v in s:\n",
    "    print(v, ':', blist.count(v))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "16"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "输入下标下限：2\n",
      "输入下标上限：5\n",
      "输入一个列表；[1,2,3,4,5]\n"
     ]
    }
   ],
   "source": [
    "y = int(input(\"输入下标下限：\"))\n",
    "z = int(input(\"输入下标上限：\"))\n",
    "c = input(\"输入一个列表；\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['1', '2', '3', '4', '5']\n",
      "['3', '4', '5']\n"
     ]
    }
   ],
   "source": [
    "q= c[1:-1].split(\",\")\n",
    "print(q)\n",
    "print(q[y:z+1])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "17"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "input your nameherry\n"
     ]
    }
   ],
   "source": [
    "d = {'Mike':'1','Marry':'2','Tom':3}\n",
    "a = input(\"input your name\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "您输入的键不存在\n"
     ]
    }
   ],
   "source": [
    "print(d.get(a,\"您输入的键不存在\"))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "18"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[3, 18, 35, 49, 14, 80, 27, 72, 53, 58, 18, 86, 61, 12, 68, 92, 61, 100, 22, 37]\n"
     ]
    }
   ],
   "source": [
    "import random\n",
    "list1 = [random.randint(0,100) for i in range(20)]\n",
    "print(list1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[3, 14, 18, 27, 35, 49, 53, 58, 72, 80, 100, 92, 86, 68, 61, 61, 37, 22, 18, 12]\n"
     ]
    }
   ],
   "source": [
    "list2 = list1[0:10]\n",
    "list2.sort()\n",
    "list1[0:10] = list2\n",
    "list2 = list1[10:20]\n",
    "list2.sort(reverse = True)\n",
    "list1[10:20] = list2\n",
    "print(list1)"
   ]
  }
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